Ejecting apparatus



March 23, 1965 R. J. STOKER EJECTING APPARATUS Filed April 4, 1963 ROBERT M STOKE/7 ATTORNEY United States Patent 3,174,673 EETING APPARATUS Robert J. Stoker, Phiilipshurg, NJL, assignor to ingersoll- Rand Company, New York, N.Y., a corporation of New Jersey Filed Apr. 4, i963, Ser. No. 270,736 Claims. Cl. 239-95} This invention relates to ejecting apparatus in general and more in particular to ejectors operated by an elastic fluid.

The commonly known type ejectors are in general in the form of a substantially elongated unit occupying considerable space, in particular when applying multi-stage ejectors formed by separately mounted units in series or units mounted in axial alignment with each other. In addition thereto the types of ejectors equipped with a steam jacket or electrical coil to prevent accumulation of ice or other frozen solids in the diifuser of the ejector occupy even more space.

It is accordingly one object of this invention to provide an ejector structure which is more compact than heretofore designed.

Another object of this invention is to provide an ejector structure in which formation of ice and the consequent reduction of the efficiency of the ejector is prevented.

These and other objects will be in part obvious and in part pointed out hereinafter and illustrated in the accompanying drawings in which:

FIGURE 1 is a longitudinal sectional view of an ejecting apparatus according to the invention;

FIG. 2 is a longitudinal sectional view of another ejecting apparatus according to the invention; and

FIG. 3 is a cross sectional view taken along the line 3-3 of FIG. 2 looking in the direction of the arrows.

Referring to FIGURE 1, 1t) designates a single stage ejecting apparatus according to this invention having a nozzle 12 of a commonly known type mounted in the ejector casing 14 adjacent the inlet 16 for the fluid to be evacuated. A difiuser 18 of the convergent-divergent tube type is connected with its inlet 20 of the converging section 22 of the diffuser to casing 14 to receive the motive fluid supplied by the nozzle 12 and the fluid to be evacuated flowing through casing 14, in a commonly known manner. The fluid flowing through dilfuser 18 flows from the converging section 22 through a throat section 24 and into a diverging section 26.

As shown in FIG. 1, diverging section 26 is made considerably shorter than in conventional type ejectors, and in order to maintain the proper velocity-pressure relationship for the fluid to be discharged from the ejector, a continuation of diverging section 26 is provided in the form of a housing 28 encircling the diffuser and in open communication with the downstream end of diverging section of the diffuser. The inner periphery of the walls of housing 28 cooperate with the outer periphery of the diffuser to form a diverging passage 30 for the fluid discharged from diverging section 26 of the diffuser. The housing 23 is formed with an end wall 32 longitudinally spaced from the downstream or discharge end of diverging section 26 of the diffuser to provide for the diversion of the flow of fluid discharged from diverging section 26 into diverging passage Eli formed in housing 28. The direction of flow of iluid through passage 30 is opposite to the direction of flow fluid through the diffuser. A discharge 34 for the fluid flowing through the difluser 1.8 and housing 28 is provided at the downstream or upper end of housing 28.

It is to be noted that, since housing 28 encircles diffuser 18, the heat available in the fluid flowing through hous- Patented Mar. 23, 19655 "ice ing 28 is utilized to warm diffuser 18 to prevent formation of ice in the diffuser.

With the arrangement as hereinbefore described, two specific features are to be noted: the provision of a compact and simplified ejector structure, and, prevention of formation of ice or other frozen solids in the dihuser of the ejector without the additional expense of auxiliary or external heat sources.

Referring to FIG. 2, another novel ejecting apparatus structure is shown. The ejecting apparatus, designated 40, is of a multi-stage type comprising three ejectors, a first stage ejector 42, a second stage ejector 44, and a third stage ejector 46, the second stage ejector positioned coaxially within the first stage ejector, and the third stage ejector positioned co-axially within the second stage ejector. In brief, the three ejectors 42, 4d and 46 are located in nesting relationship. Each ejector is in the form of a convergent-divergent tube, the third stage ejector 46 forming the central convergent-divergent tube having an inlet 48, a converging section 5%) extending upwardly from inlet 43 into a throat section 52, and a diverging section 54 extending upwardly from throat section 52 into a discharge 56 for the mixture of fluid to be evacuated and the motive fluid to operate the ejecting apparatus.

The second stage ejector 44 is also in the form of a convergent-divergent tube but of larger size than ejector 46, the inner periphery of ejector d4 radially displaced from and cooperating with the outer periphery of ejector 46 to form a convergent-divergent passage about ejector 46. 58 designates the converging passageway section of the ejector 44 extending downwardly from the inlet 66 into the throat section s2, and 64 designates the diverging passageway section extending downwardly from throat section 62.

The first stage ejector 42 is of larger size than the second stage ejector the inner periphery of ejector 42 radially displaced from and cooperating with the outer periphery of ejector 44 to form a convergent-divergent passage about ejector 44. Ejector 42 includes an inlet 66, a converging passageway section 68 extending upwardly from inlet as into a throat section '70, and a diverging passageway section '72 extending upwardly from throat section 7%.

Communication between the first stage ejector 42 and the second stage ejector 44 is achieved by connecting an end wall 74- to the upwardly extending upper end of ejector 42 to divert the flow of fluid from the diverging passageway section 72 of ejector 42 into the inlet 6t? of ejector 44. Communication between the second stage ejector 44 and the third stage ejector as is achieved by connecting an end wall 76 to the downwardly extending lower end of ejector 44 to divert the flow of fluid from the diverging passageway section 6 of ejector 44 into the inlet 48 of the third stage ejector 46.

A casing 73 is mounted on the inlet end of the first stage ejector 42 to provide for the fluid to be evacuated to be conducted to the first stage ejector inlet 66 from an inlet 8% for the fluid to be evacuated.

Motive fluid for the operation of each ejector is conducted into the inlets 66, 68 and 48 of the associated ejectors by conventional type nozzles 82, 84 and 86, respectively.

A cone type guide member 83 is mounted within casing 78 to provide for the proper introduction of the mixture of fluid to be evacuated and motive fluid into the inlet 66 of the first stage ejector 42.

With the arrangements shown the ejector structure is much more compact and occupies considerably less space than the conventionally built multiple stage ejectors, providing for a simplified and an economically made ejecting apparatus. Furthermore, this invention provides for the eflicient operation of the ejecting apparatus without the additional expense of auxiliary or external heat sources to prevent icing in the difluser of the apparatus.

While I have shown and described two embodiments of my invention it is to be understood that various changes and modifications may be made therein without departing from the spirit of the invention as set forth in the appended claims.

I claim:

1. An ejecting apparatus comprising:

(a) a first ejector having an inner wall forming a convergent-divergent passage for fluid,

(b) a second ejector positioned about said first ejector and having an inner wall formed to cooperate with the outer Wall of said firs-t ejector to form a convergent-divergent passage for fluid about said first ejector,

() each of said convergent-divergent passages having an inlet end and a discharge end and positioned such that the inlet end of said first ejector isadjacent to the discharge end of said second ejector,

(d) .wall means to define with said first and said second ejectors a passage communicating the discharge end of the first ejector with the inlet end of the second ejector to convey the flow of fluid from the first ejector to the second ejector, and

(e) means for supplying motive fluid to each of said first and second ejectors.

2. The device claimed in claim 1 in which said second ejector is positioned coaxially with said first ejector.

3. An ejecting apparatus comprising:

(a) a first convergent-divergent tube,

(b) a plurality of convergent-divergent tubes of graduated diameters relative to each other and relative to the diameter of said first convergent-divergent tube positioned coaxially with each other and with said first convergent-divergent tube and cooperating with each other to form concentrical convergent-divergent passages for the flow of fluid therethrough,

(c) each tube having an inlet end and a discharge end and positioned such that the inlet end of said first tube is adjacent to the discharge end of the next adjacent tube,

(d) the inlet end of said adjacent tube being adjacent to and in communication with the discharge end of the tube positioned about said adjacent tube,

(e) wall means cooperating with said tubes to define passages communicating the discharge end of each tube with the inlet end of the next adjacent tube, and

(f) means to supply motive fluid to the inlet end of each tube.

4. An ejecting apparatus comprising:

(a) a plurality of convergent-divergent tubes of graduated diameters positioned coaxially and in nesting relationship with each other to form concentrical convergent-divergent passages for the flow of fluid therethrough with one passage surrounding the remainder of said passages, and

(b) means to cause said fluid to flow through one of said tubes in a direction opposite to the direction of flow of fluid in the adjacent tube.

5. An ejecting apparatus comprising:

(a) a convergent-divergent tube having a converging section and a diverging section in communication with each other, 7 a

(b) inlet means for supplying a first fluid to said converging section of the tube, V

(0) means at the converging section of the tube for supplying motive fluid to said tube to entrain said first fluid,

(d) a housing for said convergent-divergent tube being in communication with the downstream end of said convergent-divergent tube and having an inner periphery cooperating with the outer periphery of said convergent-divergent tube to form a passage diverging along its entire length from the downstream end of said convergent-divergent tube to form a continuation of said diverging section of said convergentdivergent tube, and

(e) an outlet or said housing at the downstream end portion thereof.

6. The device claimed in claim 5 in which said housing is positioned coaxially with said convergent-divergent tube.

' (d) means at said converging section of the tube for supplying motive fluid to said tube to aspirate said first fluid, and

(e) outlet means for exhausting fluid from said diverging section,

8. The device claimed in claim 7 in which said sections are positioned to cause said fluid to flow in one direction through at least a portion of one of said sections and to flow in an opposite direction through at least a portion of the other section.

9. An ejecting apparatus comprising:

(a) a convergent-divergent tube having a converging section and a diverging section in communication with each other, a

(b) inlet fluid means for supplying a first fluid under relatively low pressure to said converging section, (-c) nozzle means for supplying fluid under a relatively high pressure to said converging section of said tube to aspirate said first fluid,

(d) a housing enclosing said convergent-divergent tube and in communication with the downstream end of said convergent-divergent tube having an inner periphery positioned coaxially with and cooperating with the outer periphery of said convergent-divergent tube to form a passage diverging along its entire length from the downstream end of said convergentdivergent tubeto form a continuation of said diverging section of said convergent-divergent tube, and

(e) an outlet for said housing at the downstream end portion thereof.

10. An ejecting apparatus comprising:

(a) a first tube having a converging portion and a diverging portion connected together by a throat section, v V

(b) a plurality of tubes coaxially disposed in relation to the first tube and each other,

(c) each of said plurality of tubes being complementary in shape to said first tube and each other and spaced from the first tube and each other todefine therebetween a plurality of ejector passageways,

-(d) each of said tubes having an inlet and an outlet to receive and pass fluid into and out of said ejector passageways,

(e) means adjacent the inlet of each of said tubes to supply motive fluid thereto,

( said tubes being disposed so that the inlet of one tube is adjacent the outlet of the next adjacent tube, and

(g) wall means cooperatively associated with said tubes so that the inlet of one tube is in communication with the outlet of the next adjacent tube and thereby provides for series flow of fluid through said tubes.

No references cited.

LAURENCE V. EFNER, Primary Examiner.

WARREN E. COLEMAN, Examiner. 

1. AN EJECTING APPARATUS COMPRISING: (A) A FIRST EJECTOR HAVING AN INNER WALL FORMING A CONVERGENT-DIVERGENT PASSAGE FOR FLUID, (B) A SECOND EJECTOR POSITIONED ABOUT SAID FIRST EJECTOR AND HAVING AN INNER WALL FORMED TO COOPERATE WITH THE OUTER WALL OF SAID FIRST EJECTOR TO FORM A CONVERGENT-DIVERGENT PASSAGE FOR FLUID ABOUT SAID FIRST EJECTOR, (C) EACH OF SAID CONVERGENT-DIVERGENT PASSAGES HAVING AN INLET END AND A DISCHARGE END AND POSITIONED SUCH THAT THE INLET END OF SAID FIRST EJECTOR IS ADJACENT TO THE DISCHARGE END OF SAID SECOND EJECTOR, (D) WALL MEANS TO DEFINE WITH SAID FIRST AND SAID SECOND EJECTORS A PASSAGE COMMUNICATING THE DISCHARGE END OF THE FIRST EJECTOR WITH THE INLET END OF THE SECOND EJECTOR TO CONVEY THE FLOW OF FLUID FROM THE FIRST EJECTOR TO THE SECOND EJECTOR, AND (E) MEANS FOR SUPPLYING MOTIVE FLUID TO EACH OF SAID FIRST AND SECOND EJECTORS. 